The Piscirickettsiaceae are a family of Proteobacteria

Proteobacteria

The Proteobacteria are a major group of bacteria. They include a wide variety of pathogens, such as Escherichia, Salmonella, Vibrio, Helicobacter, and many other notable genera....

. All species are aerobe and found in water
.
The species Piscirickettsia salmonis is a fish pathogen bacteria and causes Piscirickettsiosis in salmonid fish
.
It lives in cells of infected hosts and can´t be cultured on artificial media. Piscirickettsia salmonis is non-motile, where as the other five generas are motile by using a single flagellum

Flagellum

A flagellum is a tail-like projection that protrudes from the cell body of certain prokaryotic and eukaryotic cells, and plays the dual role of locomotion and sense organ, being sensitive to chemicals and temperatures outside the cell. There are some notable differences between prokaryotic and...

. None of them are pathogens.

External links

• Piscirickettsiosis Australian Government Department of Agriculture, Fisheries and Forestry
• Piscirickettsiaceae J.P. Euzéby: List of Prokaryotic names with Standing in Nomenclature